High-precision limit on variation in the fine-structure constant from a single quasar absorption system

Srđan M. Kotuš, Michael T. Murphy, Robert F. Carswell

The brightest southern quasar above redshift $z=1$, HE 0515$-$4414, with its strong intervening metal absorption-line system at $z_{abs}=1.1508$, provides a unique opportunity to p…